Burner for central-draft lamps



.' Patented Aug. 6, 1889.

Z. DAVIS. BURNER FOR. CENTRAL DRAFT LAMPS.

7 UNITED STATES PATENT FFICE.

ZEBULON DAVIS, OF CLEVELAND, OHIO.

BURNER FOR CENTRAL-DRAFT LAMPS.

SPECIFIGATION- forming part of Letters Patent No. 408,592, dated August6, 1889.

Application filed iugust 388- 1 0 all whom it nuty concern:

Be it known that I, ZEBULON DAVIS, of leveland, in the county ofCuyahoga and State of Ohio, have invented certain new and usefulImprovements in Burners for Central- Draft Lamps; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will en able others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

My invention relates to an improvement in burners for central-draftlamps.

The objects of my invention are to make the upper portion of theburner-tube smaller than its lower portion, and to form through theshoulder which extends around the tube below the small perforations aseries of holes, through which a large quantity of heated air is allowedto pass, and to place inside of the smaller end of this burner-tubeaperforated open ended conical tube, which serves to break up thecurrents of air as they rise around the sides of the burner, and thuscause a greater portion of the air which is rising through thecentral-draft tube to rise upward and strike against the heatedspreaders which form the top of the burner-tube, and thus becomethoroughly heated because it passes through the small perforations intheburnertube.

The accompanying drawing represents a vertical section of a lamp-burnerwhich embodies my invention.

A represents the lamp-bowl, B the central-draft tube provided with aninternal supporting-bead, and O the burner-tube. This burner-tube ismade large enough at its lower end to snugly fit the inside of thecentraldraft tube and is supported in position upon the bead in the tubeB. At that point in this burner-tube C where the tube is reduced in sizean inclined shoulder G is formed, and through thisshoulder are made aseries of air-holes II. This shoulder and the air-holes are located asuitable distance below the upper end of the central-draft tube, so thatall of the air which passes through these openings must pass between theheated upper end of the draft-tube and the outer side of the Serial No.282,763. (No model.)

burner-tube, and thus be heated to a higher degree before reaching theflame. The smaller perforated upper end of this burner-tube extends asuitable distance above the top of the central-draft tube and has itsupper end closed by the two spreader-plates I J, which are securedtogether, the upper one of the plates beingthe larger. The function ofthg upper larger spreader-plate is to offer a second surface for therising air-currents to impinge against, forcing them into the flame,whichis deflected outwardly, and which, meeting and mingling with theair-currents rising through the cone and up near the sides of thechimney, is caused to burn very white without odor and remarkablysteady.

Inside of the lower solid portion of the burner-tube is secured theconical perforated tube 0, which is open at both of its ends, and whichserves to break up the currents of air which rise through thecentral-draft tube into the lower end of this burner-tube, and thusprevent the air which is rising through the openings H from-formingcurrents of sufficient force to interfere with the steadiness of theflame. This cone also serves to direct the rising current of air whichpasses through its upper open end against the center of the under sideof the lower spreader-plate,where it is highly heated before-it spreadsout into the chamber formed by the upper end of the burner-tube andescapes through its fine perforations. The upper end of this open-endedperforated cone extends only above the openings H in the shoulder and upto or below the lower line of the perforations in the burnertube, as itsonly object is to break up and heat the currents of air which are risingaround the inner sides of the burner-tube, and which would pass throughthe openings II in the shoulder. The outer portion of the burner uponwhich the lamp-chimney rests will be made of the shape shown.

Having thus described my invention, I claim I 1. The combination of thelamp-bowl and the central-draft tube with a burner-tube consistin g ofthe lower imperforate portion which snugly fits the draft-tube and thesmaller upper perforated portion, the tube being provided with a seriesof perforations H, which TOO extend around the side of the burner belowthe small openings in its upper end, so that the air which rises throughthe perforations II will be heated between the outer side of theperforated part of the burner-tube and the inner side of the upper endof the centraldraft tube, substantially as shown.

2. The combination of the lamp-bowl and the central-draft tube with theperforated bu rnertube provided with a series of openings H below thefine perforations in its upper end and the open ended conical tube whichis secured in the lower end of the burner-tube and in a differentVertical plane from the fine perforations in theburner-tube,substantially as described.

ZE'BULON DAVIS. Witnesses:

F. L. ALCOTT, W. B. WHITING.

